ブラジャー着用時と非着用時の運動中の乳房振動特性  [in Japanese] Vibration Characteristics of Breasts during Exercise with and without a Brassiere  [in Japanese]

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Abstract

着心地の良いブラジャーの設計や新しい設計システムを構築するためには,複雑に動く乳房の運動機構やブラジャー着用に伴う乳房振動特性の変化を明らかにしておくことが重要である.そこで,本研究では半透明なブラジャーを用いて,運動画像解析システムにより,ブラジャー着用時と非着用時の走行中と歩行中の乳房の動きを計測した.乳房の動きから体幹部の動きを分離し,乳房独自の振動データを抽出した後,離散フーリエ変換によって分析した.その結果,乳房の振動は歩行周期の影響を直接に受け,走行中が歩行中より,垂直方向が水平方向より大きくなった.ブラジャー非着用時の垂直方向の振幅は歩行周波数で最大となり,体幹部の運動の影響を強く受けることが分かった.非着用時の乳房振動は乳房の硬さ指標と相関が高く,柔らかい乳房が硬い乳房より振幅が大となった.ブラジャーの着用によって,乳房の振幅スペクトルに高い周波数成分が生じるようになり,測定点間の相関も低くなった.またブラジャー着用時の乳房が硬い乳房に近くなり,両者の特性が似たものとして表れた.以上のように乳房振動を分析し,その特性をとらえることができた.乳房の振動特性は,ブラジャーの着くずれや着心地に関係する問題を含み,設計に欠かすことのできない要因である.ブラジャーの設計支援システムの中で,乳房の振動特性をどのように制御するかが重要な課題である.今後は胸部の3次元形状データのモデルを利用して,運動機能性のよいブラジャー設計の技術開発につなげたいと考えている.

Brassieres are used to prevent excessive movements of the female breasts, which consist of mammary glands and fat tissue. To obtain basic data for designing good-fitting brassieres, vibration characteristics of the breasts were analyzed in 7 females. The movement of 14 measuring points on the breast surface was monitored during walking and running with and without wearing a transparent brassiere. Frequency characteristics of the breast vibration were analyzed. The frequency of breast vibration had a strong correlation with the stepping frequency. The amplitude of breast vibration was greater during running than during walking, and greater along the vertical axis than along the horizontal axis. Without wearing a brassiere, a negative correlation was noted between the amplitude of breast vibration and the stiffness of the breast. The amplitude was greater in soft breasts than in hard breasts. When wearing a brassiere and in firm breasts, high-frequency components were observed in the waveform of breast vibration.

Journal

  • Journal of home economics of Japan   [List of Volumes]

    Journal of home economics of Japan 54(9), 731-738, 2003-09-15  [Table of Contents]

    The Japan Society of Home Economics (JSHE)

References:  11

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Cited by:  4

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Codes

  • NII Article ID (NAID)
    110003166950
  • NII NACSIS-CAT ID (NCID)
    AN10040097
  • Text Lang
    JPN
  • Article Type
    Journal Article
  • ISSN
    09135227
  • NDL Article ID
    6690090
  • NDL Source Classification
    ZE16(社会・労働--家事・家政--学術誌)
  • NDL Call No.
    Z6-113
  • Data Source
    CJP  CJPref  NDL  NII-ELS 
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